alright so i decided to mill my head and raise my compression. i have a stock dual cam zc motor. my friend just recently milled his stock dual cam zc motor. it was milled 60 thou. he retarded his timing and it is running properly and is pulling strong. by seeing this and feeling the big difference i have decided to mill my head as well. problem is i dont think i should go with 60 thou. i was wondering wuts the max i should go wit no problems.
thanx

 

bump

 

1.4 mm is what I heard/read on thezcr.com i beleive.